黄腐酸对铜(Ⅱ)的吸附行为及吸附机理的研究

Study on the adsorption behavior and mechanism of Cu(Ⅱ) on fulvic acid

采用振荡吸附法研究黄腐酸对铜（Ⅱ）的吸附行为，分别考察了时间、pH值、温度等对黄腐酸吸附Cu（Ⅱ）过程的影响。结果表明，pH=6．5～10．5，吸附量较大，且基本稳定，不随pH值的变化而变化；pH=7，黄腐酸对Cu（Ⅱ）的吸附量随时间的增大而增大。从吸附等温线可看出，黄腐酸对铜（Ⅱ）的吸附符合FreundUch吸附等温模型：吸附为吸热过程，吸附热△H为36．2475kJ／mol，吸附过程主要为物理吸附。

The adsorption batch method was used to study the adsorption mechanism of Cu （Ⅱ）. Mean- while, the effects of time,pH and temperature on the adsorption process was also investigated. The result showed that when pH was 6.5 - 10.5, adsorption was larger and stable and did not vary with the variable pH. While pH was 7, the amount of adsorption became bigger with the longer time. From the adsorption isotherms curve,we can find that the adsorption of Cu（Ⅱ） on fulvic acid is an endothermic program and also in accord with the Freundlich adsorption isotherms model. The adsorption caloric △H is 36.247 5 kJ/mol.